Interupt pinouts don't seem to match on Mega2560 data

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i have been looking @ interrupt pin outs, into, int1... on page, atmega2560-arduino pin mapping
http://arduino.cc/en/hacking/pinmapping2560 ,
and data reference page attachinterrupt(),
http://arduino.cc/en/reference/attachinterrupt .
the interrupt descriptions on 1 page not match other. int0 on pin outs page digital pin 21, , int1 digital pin 20, etc. information on reference page attachinterrups(), int0 digital pin 2, , int1 digital pin 3. confusing. meant way, or error?

stank



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